Seismic-induced surficial failure of cohesive slopes using three-dimensional limit analysis:A case study of the Wangjiayan landslide in Beichuan, China  

作　　者：Gao Yufeng Liu Yang Geng Weijuan Zhang Fei 

机构地区：[1]Key Laboratory of the Ministry of Education for Geomechanics and Embankment Engineering,College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China [2]Department of Civil Engineering,Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China

出　　处：《Earthquake Engineering and Engineering Vibration》2024年第3期537-545,共9页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant Nos.52378335 and 52322808.

摘　　要：A seismic-induced landslide is a common geological catastrophe that occurs in nature.The Wangjiayan landslide,which was triggered by the Wenchuan earthquake,is a typical case in point.The Wanjiayan landslide caused many casualties and resulted in enormous property loss.This study constructs a simple surficial failure model based on the upper bound approach of three-dimensional(3D)limit analysis to evaluate the slope stability of the Wangjiayan case,while a traditional two-dimensional(2D)analysis is also conducted as a reference for comparison with the results of the 3D analysis.A quasi-static calculation is used to study the effect of the earthquake in terms of horizontal ground acceleration,while a parametric study is conducted to evaluate the critical cohesion of slopes.Rather than employing a 3D analysis,using the 2D analysis yields an underestimation regarding the safety factor.In the Wangjiayan landslide,the difference in the factors of safety between the 3D and 2D analyses can reach 20%.The sliding surface morphology as determined by the 3D method is similar to actual morphology,and the parameters of both are also compared to analyze the reliability of the proposed 3D method.

关 键 词：LANDSLIDE Wenchuan earthquake surficial failure limit analysis stability QUASI-STATIC 

分 类 号：P315.9[天文地球—地震学] P642.22[天文地球—固体地球物理学]